[Mp4-tech] fast forward & backward in mpeg-4

[Daljit]

Hi!
You can implement fast forward /rewind functionality by decoding only I
frames in the stream in required direction.
You may even choose to skip fix number of these I frames before decoding.
i.e. you may choose to decode every fifth I frame in the stream.
For MPEG-4 there can be max 132 inter-coded macroblocks at same location
from consecutive frames  between two intra-coded macroblocks in the
sequence.
To keep things simple, avoid more than 132 P frames inbetween two I frames.
Regards
-Daljit
  -----Original Message-----
  From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Gopalakrishnan
Srinivasan
  Sent: Wednesday, February 02, 2024 6:43 PM
  To: mp4-tech lists.mpegif.org
  Subject: [Mp4-tech] fast forward & backward in mpeg-4
  Hello Experts,
                       I am looking into implementation of fast forward and
fast backward in MPEG-4 simple profile & simple level video decoder. But I
dont find any information how can we do this. Can anybody help me how can we
do this.
                      Also in MPEG-4 video whether there is any maximum
limit to place number of "P" frames inbetween two "I" frames.
  Thanks & Regards,
  SGK
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